<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatiple" content="IE-edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>before和created钩子函数的使用</title>
    <script src="/web1/js/vue.js"></script>
</head>
<body>
    <div id="app">
       <div v-if="isShow" ref="self">
        test

       </div>
       <button @click="isShow=!isShow">更新</button>

    </div>
    <script>
        var vm=new Vue({
            el:'#app',
            data:{
                isShow:false
            },
            beforeUpdate(){
                console.log("更新之前")
                console.log(this.$refs.self)
            },
            updated(){
                console.log('更新之后')
                console.log(this.$refs.self)
                
            }
        })
    </script>
</body>
</html>